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Matek F405 wing won't boot without USB first

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@cyber_06_wolf wrote:

I’m having a very strange issue… If I use just a battery, I can’t get servo outputs. If I plug in a USB first, then a battery, everything works fine. I took a multimeter and all the voltage rails are showing the proper voltages. If I hook up a battery and then the USB it doesn’t work either. It has to be USB first, then battery. I can’t get any sort of logs out of the FC, is it dead?

I’ve tried reflashing firmware multiple times with full chip erase with the same issue.

Any clues? I took a video of the issue
https://youtu.be/EACz_oE1_7I

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